Pressure-reducing mechanism for motive-fluid drills.



lll

g1/1 /ueafl to@ Patented Aug. 15, 1911.

D. S. WAUGH. i PRBSSURBREDUGING MBGHANISM PoR MOTIVE FLUID 1,000,467.

APPLICATION FILED MAY 25. 1907.

Q U tf1-1.o one o gw @im UNITED sTATEs PATENT oEEicE.

DANIEL S. WA'UGH, OF DENVER, COLORADO, ASSIGNOR TO THE DENVER ROCK `DRILL AND MACHINERY COMPANY,'- OF DENVER. COLORADO.

PRESSURE-REDUCING MECHANISM FOR MOTVE-FLUID DRILLS.

Specification of Letters Patent. Patented Aug, 15, Application mea may 25, 1907. serial No. 375,741.

Colorado, have invented certain new and useful Improvements 1n Pressure-Reducing @a Mechanism for Motive-Fluid Drills; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to makeand use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specication.

The presentinvention relates more particularly to drilling mechanism of the motive fluid-operated type, and one of the objects of said invention is to provide novel, simple and compact means for controlling the supply of motive fluid to the motor 'and to motive fluid-operated feeding means employed for maintaining the drlll in opera tive position with respect to the work.

As heretofore constructed, it has been customary to utilize the full pressure of the motive uid that is used for operating the motor, in the feeding means to hold the drill in place. This pressure is often much eater than is necessary or desirable, and a further object of the present invention is to rovide means for altering the pressure in the feeding means as circumstances may re uire.

ne embodiment trated in the accompanying o drawings, wherein Figu and partiall pneumatic sectional view -on theline 2*-2 o Fig. 1. Fig." 3 is a plan view of the locking device for the pressure reducing mechanism. Fig. 4 is 'a sectional view on the line 4-4 of Fig. 3. Fig. 5 is a detail sectional view at right angles to Fig. 2.

`in section of a portion of la respondingparts in all the gures of the drawings. A

In the embodiment illustrated, the -dr1ll in which is rotatably communicates with of the invention is illusre 1 is a view partially in elevationrill. Fig. 2 1s a longitudinal' 'motive flui ila'r reference numerals designate cor-` body as a whole, is designated 5, and is provided at one end with a suitable motive fluid operated motor, and at its other end with motive 'luid operated feeding means forsuch motor. A connection in the form of a body and valve casingv is interposed between the motor and feeding means, as shown in Fig. 2, and contains a valve seat, mounted a valve 6 one side of the body, as shown in Fig. 1'. Said projecting portion constitutes means for rotating the valve. The wall is furthermore provided with a port 18 that leads from the valve seat, and the motor.L It is also provided with a port- 9 having an extension 32, said port 9 communicating with the chamber 12, from which leads a rearwardly extending port 33. The valve 6 is provided with an internal chamber 31 and lateral ports 17 and 30 that are respectively movable into and out of register with the ports 18 and 9 and the extension 32 of the latter'. A supply conduit 7, leading from any suitable source of motive fluid ndervpressurc, is connected by a coupling 8 to the side of the body opposite to that from which the valve 6 projects, and this coupling delivers motive "fluid under pressure to. the 'internal chamber '31 of the valve.

The motive fluid-operated feeding means consists of a cylinder 35 having its outer or rear end closed by a cap 36 secured thereto and provided with a spur 37. Thecapalso has an internal chamber 39. A pistonreciprocates within the cylinder 35 and corn rises a head with a packing washer 40, the latter being held in place on the head by a coupling -having a longitudinal passage 38 therethrough. This piston is carried by a tubular piston rod 34 that projects from the inner end of the cylinder 35, and is-secured to the rear end of the body, as shown in Fig. 2. The port- 33 communicates with the interior ofthe iston rod 34, and consequently j d) admitted through said port, will -pass through the pistony rod through the channel 38 and into the chamber 39 so that itgwill act against the rear face of the p'iston, as will be obvious.

that projects from Operating in the chamber 12 over the end of the port 9 is pressure-reducing mechanism, the same preferably comprising la cap' valve 15 that is located in said chamber,

and is yieldingly maintained upon the bottom .thereof over the port 9 by a coiled spring 19. This spring is borne vupon by a tension nut 20'having a threaded engagement, as shown at 2 with a rotary shaft 22. The shaft 22 is journaled in a nut 14 having a plug portion 13 threaded as shown at 10 into the outer portion of the chamber 12. The nut 14 has an outstanding flange 23 surrounding the outer end of t-he shaft 22 and provided with a series of notches 26 and an outstanding stop lug 28. A locking dog 24 isy pivoted, as shown at 23a upon the outer end ofthe shaft, and has .a handle 25 that is arranged to lit in the different notches 26 and abut against the stop lug 27, bearing against the nut' and located in a socket in the dog, serves' to normally maintain the handle 25 in the notches. To prevent the rotation of the tension nut 20, a pin 29 is provided that is slidably engaged by said nut.

The operation of the structure is substantially as follows. Assuming that motive fluid-under pressure is being delivered to the conduit 7, it will bepobvious that if the valve 6 is in a position with `the ports 17 and 30, as indicated in dotted lines in'F ig. 2, such motive fluid is entirely cut off both from the motor and the feeding means. If now the valve 6 is rotated in a direction -opposite to the larrow shown in Fig. 2, the port 30 will first be brought into communication with the port 9 and the motive fluid will consequently be delivered through said port 9 against the cap Valve 15. This valve will be raised by the pressure and the motive kfluid will flow through theport 33, the pis-l ton rod 34 and the channel 38 into the chamber 36. Here it will act against thepiston and force the same outwardly, carrying `the motor with it in a manner well understood.

f now the valve the port 17 will be vbrought into communication with the port 18 and the motive fluid willbe delivered to the motor, the port 30 still maintaining its communication with the port 9 by means of the extension 32. In this structure, the pressure of the motive fluid delivered to the feeding means can be varied as shown by raising the handle 25 out of the notch 26, in which yit may be engaged and rotating said handle. This will cause the n ut 20 to move inwardly or' outwardly,

28. A spring` 6 is turned still further,y

thereby varying the ltension upon the spring 19 as will be obvious. Asa result, the pressure of the motive fluid can bechanged at any time, without in anymanner altering or affecting thel pressure in the motor.

It is to be observed in this structure that ing means therefor, a valve easing having ated motor, of motive all the mechanism is compactly and is in convenient relation to an operator. The coupling 8 is located directly opposite the operating handle of the valve 6, and the adjusting mean-s for the pressure-reducing mechanism is disposed on a different side, as

shown clearly in Fig. 1.

Having thus fully described my invention, what I claim as new, and desire to secure y Letters Patent, is

1. In a structure of the character set forth,

the combination with a motive fluid operated motor andmotive fluid operated feeding means therefor, of means for delivering motive fluid under pressure to the motor and to thev feeding means, and mechanism for varying the pressure of the motive fluid delivered to the feeding means without affecting the pressure of the fluid delivered to the motor. 3. In a structure of the character set fort the combination with ated motor, and motive fluid operated vfeeding means therefor, of a` supply conduit having branches leading krespectively to the motor and to the feeding means, and variable pressure reducing'. nieanslocated in the branch that leads to the feeding means 4. In a structure of the character set forth, the combination with a motive fluid operated motor, of l'motive fluid Operated feedports leading to the motor and to the feeding means, means for delivering motive Huid t'o the casing, a valve'i'n the casing controlling the ports, andl variable pressure reducing mechanism located in the Vport that leads to the feeding means.

5. In' a'structure of the characterrset forth, the combination with Aa motive fluid operfluid operated feeding means therefor, a body located between the motor and feeding means,v said body having a valve seat, ports leadingtherefrom to the motor and tothe feeding means, a controlling valve operatin in the seat and projecting'fromone side o the-body, means connected to another side of the bodyv for delivering motive `fluid to the valve, and pressure reducing mechanism located in the port that leads to the feeding-means, said ressure reducing mechanism projecting rom still another side' of the bod i 6. In a structure of the. character set forth, the combination vwith a motive fluid operarranged 65 a motive fluid oper- 85 a motive fluid operated motor, of motive fluid operated feed- In testimony whereo I affix my signature ing means therefor, means for delivering in presence of two witnesses.

motive Huid to the motor and feeding means, 1

including separate channels leading thereto, f DANIEL S' WAUGH' and variable pressure-reducing mechanism Witnesses:

controlling the passage of motive iuid DENA NELSON,

through one of said channels. A.' J. OBRIEN. 

